vt. 1.保留；保持；保有；维持。 2.留住；挡住。 3.记住。 4.雇用，聘用(律师等)。 短语和例子 retain an appearance of youth 保有年轻的外貌。 retain one's presence of mind 镇定自若。 retained object 【语法】保留宾语〔如：He was given a book 中的 book, 和 A book was given him 中的 him〕。 retaining fee 预诉辩护费。 retaining force 【军事】牵制队。 retaining wall (防止沙土崩溃的)护堤壁，撑壁。 retaining works 拦水工程；蓄水工程。 adj. -able 能保持[保有，留住]。
keep in one''s mind; "I cannot retain so much information"
secure and keep for possible future use or application; "The landlord retained the security deposit"; "I reserve the right to disagree" 同义词：hold, keep back, hold back,
allow to remain in a place or position or maintain a property or feature; "We cannot continue several servants any longer"; "She retains a lawyer"; "The family''s fortune waned and they could not keep their household staff"; "Our grant has run out and we cannot keep you on"; "We kept the work going as long as we could"; "She retained her composure"; "this garment retains its shape even after many washings" 同义词：continue, keep, keep on,
hold back within; "This soil retains water"; "I retain this drug for a long time"; "the dam retains the water"
RETAIN is a mainframe based database system, accessed via IBM 3270 terminals (or more likely, emulators), used internally within IBM providing service support to IBM field personnel and customers.
例句与用法
1.
These cells had retained a diploid karyotype . 这些细胞持有二倍体核型。
2.
It's only a retaining fee, you see . 这只是一笔预约费啊，知道吗。
3.
Most of it has been retained in alternate husbandry . 其中大部分成为轮作草地。
4.
It is sufficient to retain only the first two digits . 只需取头两位数字就够了。
5.
Dicotyledonous plants retain a series of strands . 双子叶植物中保留着一系列的束。
6.
I wish to retain it as a precious memory . 我愿意把它保留在心头，作为珍贵的记忆。
7.
The parent company retains more decision-making power . 母公司拥有更多的决策权力。
8.
Old associations retained their influence over her . 从前的朋友仍对她有相当的影响。
9.
Lungs retain relatively insoluble particulate material . 肺脏内留有不溶解的颗粒物质。
10.
Whomever i quote , you retain your opinion . 我无论引用什么人的话，你都不改变你的意见。
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